﻿/*
 * Copyright (c) 2011
 * Thomas Rozanski, Geoffrey Wright, Zachary Lynn, Jesse Natalie
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THOMAS ROZANSKI, GEOFFREY WRIGHT,
 * ZACHARY LYNN, OR JESSE NATALIE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;

namespace Pinball
{
    /// <summary>Gives the average elapsed time between the start and end points.</summary>
    public class Timer
    {
        private DateTime start, end;
        private TimeSpan duration;
        private int[] buffer;
        private int index, size;

        public Timer()
        {
            size = 20;
            buffer = new int[size];
            index = 0;
        }

        /// <summary>Start the timer.</summary>
        public void Start()
        {
            start = DateTime.Now;
        }

        /// <summary>Stop the timer.</summary>
        public void End()
        {
            end = DateTime.Now;

            duration = end - start;

            buffer[index++] = (int)duration.TotalMilliseconds;

            // Wrap around buffer
            if (index == size) { index = 0; }
        }

        /// <summary>Get the elapsed time.</summary>
        public string Elapsed()
        {
            int sum = 0;

            for (int i = 0; i < size; i++)
            {
                sum += buffer[i];
            }

            return (sum / size).ToString();
        }
    }
}
